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High

HTTP Request Smuggling in Netty

  • Disclosed: 11.10.2019
  • Updated: 11.10.2026 12:22

Netty before 4.1.42.Final mishandles whitespace before the colon in HTTP headers (such as a "Transfer-Encoding : chunked" line), which leads to HTTP request smuggling.

Affected software

Click a technology to see all vulnerabilities affecting it.

PlatformPackageVulnerable versionsFixed in
Java / Kotlin (Maven) io.netty:netty >= 3.3.0.Final, <= 4.0.0.Alpha8 no fix
Java / Kotlin (Maven) io.netty:netty-all >= 4.0.0.Beta1, < 4.1.42.Final 4.1.42.Final
Java / Kotlin (Maven) org.jboss.netty:netty <= 3.2.9.Final no fix

References

CVSS score 7.5/10
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Weakness (CWE)
CWE-444
Platform
Java / Kotlin (Maven)
Package
io.netty:netty, io.netty:netty-all, org.jboss.netty:netty
Disclosed
11.10.2019
Updated
11.10.2026 12:22

Sources and licenses

OSV / GitHub Advisory Database - GHSA-p979-4mfw-53vg - CC BY 4.0

Vulnerability history: org.jboss.netty:netty

All published vulnerabilities of this package (Java / Kotlin (Maven)), newest first. Shows whether this is a one-off slip or a package that needs watching.

All (10) in the archive
Total entries
10
First → latest
10.2019 12.2021
Without a fix
9
Exploited in attacks
0

Severity breakdown

  • Critical 1
  • High 4
  • Medium 5

Disclosures per year

Severity:
  1. SnappyFrameDecoder doesn't restrict chunk length any may buffer skippable chunks in an unnecessary way
    High · 7.5 CVE-2021-37137 all versions no fix
  2. Bzip2Decoder doesn't allow setting size restrictions for decompressed data
    High · 7.5 CVE-2021-37136 all versions no fix
  3. Information Exposure in Netty
    High · 7.5 CVE-2015-2156 < 3.9.8.Final, >= 3.10.0, < 3.10.3.Final 3.9.8.Final, 3.10.3.Final
  4. HTTP Request Smuggling in Netty
    Critical · 9.1 CVE-2019-20444 all versions no fix
  5. HTTP Request Smuggling in Netty this entry
    High · 7.5 CVE-2019-16869 <= 3.2.9.Final no fix

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